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GPT-5.1 vs o1

OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.

  • GPT-5.1 has the higher intelligence index (89 vs 65.4)
  • GPT-5.1 is cheaper ($1.25 vs $15.00 per 1M input)
  • GPT-5.1 is faster
  • GPT-5.1 has a larger context window (400K)
GPT-5.1o1
Intelligence index8965.4
DeveloperOpenAIOpenAI
TypeLLMLLM
AccessAPI onlyAPI only
Context window400,000 tokens200,000 tokens
Input price$1.25 / 1M$15.00 / 1M
Output price$10.00 / 1M$60.00 / 1M
Speed115 tok/s66 tok/s
ReleasedNovember 12, 2025December 5, 2024
Parameters
Input modalitiesText, ImageText, Image
Output modalitiesTextText

Shared benchmarks

GPT-5.1
o1
GPQA Diamond
88.1
78
Humanity’s Last Exam
26.5
7.7
LiveCodeBench
86.8
67.9
MMLU-Pro
87
84.1